Peter Mantell’s Life Journey – How He Became the Sales Tax Guru at Ampersand

When the Sales Tax crises hit Amazon sellers in the US and they were facing potential bankruptcy if the laws were executed, Peter came to the rescue. Onboarding 10 clients a day who were desperate to get help with this dire situation.


Here's Peter Mantell - Sales Tax Guru inspiring life story, the founder of Ampersand Accounting. Peter's journey from a curious and inquisitive child to a successful entrepreneur is a testament to the power of embracing one's quirks, resilience, and the pursuit of passion. Join us as we explore the key events and experiences that shaped Peter's path to success.

About Peter Mantell

Peter, the founder of Ampersand Accounting, is a seasoned entrepreneur and expert in tax law and accounting. With a passion for helping small businesses navigate complex tax and accounting issues, he has successfully defended numerous clients in audits. Peter's valuable insights into the world of entrepreneurship, sharing personal stories, practical tips, and expert advice. You can find and connect with Peter Mantell on LinkedIn

Embracing Uniqueness

As a child, Peter was always curious and inquisitive. However, he also faced challenges as he was diagnosed with ADHD. Despite these hurdles, Peter had a natural inclination to explore loopholes and find unconventional solutions to problems. Simultaneously, he possessed a deep passion for learning and understanding complex subjects. As Peter grew older, he learned to embrace his quirks and gain a better understanding of himself, which ultimately paved the way for his success. Peter emphasizes the significance of laughter and curiosity in his company.

Resilience, Compassion, and Conservative Approach

Peter's journey of self-discovery and resilience was further shaped during his time abroad, particularly during a religious mission and his two-year stay in Argentina. Living in a country that experienced an economic collapse taught him the importance of being conservative and having emergency reserves. Moreover, Peter gained insights into different psychologies and approaches to problem-solving, along with the value of compassion and empathy. His experiences abroad also highlighted the need to maintain one's humanity, regardless of the circumstances. Working for Rosetta Stone in Latin America, Peter contributed to educational projects aimed at combating criminal activities and facilitating employment opportunities in the hospitality sector.

Building a Career at Rosetta Stone

Peter's journey took him to Rosetta Stone, where he started as a snot-nosed kid and climbed the ranks to build the company's international business from scratch. His work involved collaborating with foreign governments on ESL projects in Latin America. Through education and certification programs in the hospitality sector, Peter helped combat illegal activities and provide employment opportunities.

Intriguing Travel Experiences

Peter's life has been filled with interesting travel experiences. One such incident occurred when he and a friend were confronted by government officials while taking pictures as tourists. Due to suspicion surrounding the subjects of the photographs, they were asked to delete certain pictures and swiftly departed the scene. Such encounters have enriched Peter's perspective on different cultures and reinforced the need for caution while traveling.

Appreciating Home and Kindness

Although Peter initially sought to escape from home by volunteering in Argentina, his experiences led him to appreciate his home country and the privileges it offers. He values the importance of traveling and exploring the world, as it broadens horizons and fosters personal growth. Additionally, Peter emphasizes the power of kindness, which he views as a remarkable quality that can positively impact others.

Entering the World of E-commerce

After returning from his South American journey, Peter's phone started ringing with tech companies interested in expanding into the Latin American market. Recognizing the potential for growth, Peter warned them about the challenges associated with penetrating the market. Despite his intrigue with Latin America as a place to live, his focus shifted towards building his own Amazon e-commerce store.

From Retail Arbitrage to Ampersand Accounting

Peter's entrepreneurial spirit led him to start an Amazon e-commerce store, initially focusing on retail arbitrage. The thrill of manually scanning items and sending them to Amazon for profit captivated him. As he explored the e-commerce industry, Peter saw tremendous potential for growth. In parallel, he also worked in Latin America, translating legal and accounting documents for a publicly traded company.

A Language of Law and Accounting

The transition to working in accounting and legal fields was like learning a different language for Peter. He had to quickly grasp the intricacies of law and accounting through crash courses and guidance from professionals. His initial exposure to accounting involved translating documents from English to Spanish, requiring a deep understanding of both languages and legal concepts.

Tax treaties between countries

Tax treaties became a focal point of Peter's work, as he navigated the complex web of international tax laws and regulations. This was a challenging endeavor, but one that Peter approached with determination and an unwavering commitment to excellence. He immersed himself in the intricacies of tax treaties, unraveling their nuances and ensuring compliance for his clients.

“Human error was always going to be an issue and so as long as we had humans directly involved with the processes without some form of systems in place to have better greater transparency, we were doomed to fail.” - Peter Mantell

The Birth of Ampersand Accounting

As Peter continued his work in the accounting and legal fields, he began to see a gap in the market. Many small businesses and entrepreneurs lacked the resources and knowledge to navigate the complexities of international tax compliance. It was at this moment that the seed for Ampersand Accounting was planted.
Driven by his passion for helping others and his desire to simplify the accounting process, Peter embarked on a new venture. He founded Ampersand Accounting, a company dedicated to providing tailored accounting services to businesses operating globally. With a vision to empower entrepreneurs and make international tax compliance accessible, Peter poured his heart and soul into building his business.

The Aqueduct

Aqueduct, the crown jewel of Ampersand Accounting, emerged from Peter's passion for simplifying complex processes. With his team of brilliant minds, he created a powerful software that effortlessly streamlined accounting tasks, paving the way for entrepreneurs to focus on their true passions and drive their businesses forward.

Overcoming Challenges and Embracing Growth

The journey of entrepreneurship was not without its challenges. Peter faced countless obstacles along the way, from navigating changing tax regulations to building a team that shared his vision. There were moments of doubt and uncertainty, but Peter's resilience shone through.
With every setback, Peter learned valuable lessons and used them as stepping stones for growth. He embraced a mindset of continuous learning and adaptation, always seeking new ways to improve his services and expand his knowledge. It was this unwavering determination that propelled Ampersand Accounting to new heights.

Empowering Entrepreneurs and Making a Difference

Today, Ampersand Accounting stands as a testament to Peter's unwavering dedication and passion. The company has become a trusted partner for entrepreneurs and businesses looking to navigate the complex world of international tax compliance. Through personalized solutions, Peter and his team empower their clients to focus on what they do best – building and growing their businesses.
But it doesn't stop there. Peter's vision extends beyond just providing accounting services. He aims to make a meaningful impact on the lives of entrepreneurs, helping them achieve their dreams and create a lasting legacy. His genuine care for his clients is evident in every interaction, and his commitment to their success is unwavering.

Key Takeaways:

  1. Embrace your quirks and understand yourself better to succeed in life.

  2. Learn from different experiences and cultures to broaden your perspective.

  3. Stay informed about tax laws and regulations to protect your business.


Q1: How did Peter's experiences in Argentina shape his entrepreneurial journey? Peter's time in Argentina exposed him to different psychologies and approaches to problem-solving. He learned the importance of compassion, empathy, and resilience, which became invaluable in his entrepreneurial endeavors.

Q2: How did Peter's work at Rosetta Stone contribute to his success? Peter's work at Rosetta Stone allowed him to build international business connections and expand his expertise in the field of education and language learning. This experience laid the foundation for his future ventures.

Q3: What resources can help entrepreneurs navigate sales tax compliance? Platforms like TaxJar and Avalara provide comprehensive tax compliance solutions specifically designed for e-commerce businesses. They automate tax processes and ensure businesses stay compliant with state and local tax regulations.


Peter's journey as an entrepreneur is a testament to the power of embracing one's quirks, overcoming challenges, and continuously learning and adapting. Through his experiences, he has built a successful accounting firm that not only provides exceptional services but also advocates for the rights of small businesses. Peter's story serves as an inspiration for aspiring entrepreneurs, reminding them that with passion, resilience, and a commitment to lifelong learning, they too can navigate the challenges of entrepreneurship and achieve their goals.


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